EP 0892484 A1 19990120 - Electric motor
Title (en)
Electric motor
Title (de)
Elektrischer Motor
Title (fr)
Moteur électrique
Publication
Application
Priority
JP 20856097 A 19970717
Abstract (en)
An electrical motor includes a cylindrical magnet (1) divided into n regions circularly around at least an outer circumference thereof that are magnetized in alternate polarities. The motor also includes first and second coils (2) arranged in an axial direction of the magnet. The magnet is interposed between the first and second coils. The motor further includes first and second external portions excitable by current flowing through the first and second coils, respectively, so that these portions become first and second external magnetic poles, respectively. The first (18a,18b) and second (19a,19b) external portions face the outer circumference of the magnet at one side and the other side thereof, respectively. The area of the first and second external portions facing the outer circumference of the first and second coils, respectively, is equal to or smaller than three-quarters of the area of the outer circumference of the first and second coils, respectively. The motor also includes first and second internal portions excitable by current flowing through the first and second coils, respectively, to cause these portions to become first and second internal magnetic poles (18c,18d,19c,19d), respectively. The first and second internal portions face the internal circumference of the magnet on the one and the other sides of the magnet, respectively. <IMAGE>
IPC 1-7
IPC 8 full level
H02K 37/14 (2006.01); H02K 37/12 (2006.01)
CPC (source: EP US)
H02K 37/12 (2013.01 - EP US)
Citation (search report)
- [Y] US 4754183 A 19880628 - GERBER HERMANN [CH]
- [A] DE 4423952 A1 19950112 - MITSUBISHI MATERIALS CORP [JP]
- [DPA] EP 0801459 A1 19971015 - CANON KK [JP]
- [ADP] EP 0851560 A1 19980701 - CANON KK [JP]
- [X] PATENT ABSTRACTS OF JAPAN vol. 10, no. 319 (E - 450)<2375> 30 October 1986 (1986-10-30)
- [XY] PATENT ABSTRACTS OF JAPAN vol. 010, no. 319 (E - 450) 30 October 1986 (1986-10-30)
- [A] PATENT ABSTRACTS OF JAPAN vol. 011, no. 338 (E - 553) 5 November 1987 (1987-11-05)
- [A] PATENT ABSTRACTS OF JAPAN vol. 014, no. 537 (E - 1006) 27 November 1990 (1990-11-27)
- [AD] PATENT ABSTRACTS OF JAPAN vol. 015, no. 433 (P - 1271) 5 November 1991 (1991-11-05)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0892484 A1 19990120; EP 0892484 B1 20021016; DE 69808705 D1 20021121; DE 69808705 T2 20030227; JP 3517556 B2 20040412; JP H1141902 A 19990212; US 6046517 A 20000404
DOCDB simple family (application)
EP 98112712 A 19980709; DE 69808705 T 19980709; JP 20856097 A 19970717; US 11178698 A 19980708